<!--SIF Implementation Specification 2.2-6 (March 17, 2008)-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" targetNamespace="http://www.sifinfo.org/infrastructure/2.x" xmlns:sif="http://www.sifinfo.org/infrastructure/2.x" elementFormDefault="qualified">
  <xs:import namespace="http://www.w3.org/XML/1998/namespace" schemaLocation="imports/xml/xml.xsd" />
  <xs:complexType name="AggregateStatisticFactType">
    <xs:annotation>
      <xs:documentation>This object is the actual value of the measurement. It is always associated with one statistic and one or more characteristics.</xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name="AggregateStatisticInfoRefId" minOccurs="0" type="sif:IdRefType">
        <xs:annotation>
          <xs:documentation>
							Reference to statistic defined by </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="Characteristics" minOccurs="0">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="AggregateCharacteristicInfoRefId" minOccurs="0" maxOccurs="unbounded" type="sif:IdRefType">
              <xs:annotation>
                <xs:documentation>
								Reference to an AggregateCharacteristicInfo object.
							</xs:documentation>
              </xs:annotation>
            </xs:element>
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="Excluded" minOccurs="0" nillable="true">
        <xs:simpleType>
          <xs:restriction base="xs:token">
            <xs:enumeration value="Yes" />
            <xs:enumeration value="No" />
          </xs:restriction>
        </xs:simpleType>
      </xs:element>
      <xs:element name="Value" minOccurs="0" type="xs:decimal">
        <xs:annotation>
          <xs:documentation>Value of the fact.</xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="SIF_Metadata" minOccurs="0" nillable="true" type="sif:SIF_MetadataType" />
      <xs:element name="SIF_ExtendedElements" minOccurs="0" nillable="true" type="sif:SIF_ExtendedElementsType" />
    </xs:sequence>
    <xs:attribute name="RefId" use="required" type="sif:RefIdType" />
  </xs:complexType>

  <xs:element name="AggregateStatisticFact" type="sif:AggregateStatisticFactType" />

</xs:schema>